Now tonight we want to show you a videotape which addresses the big question. Did the syrian government use chemical agents of any kind against their own people? Veteran repoel from our partners at the bbc traveled to the syrian town on this tape and takes us through it. Reporter: On the 29th of april, saraqeb came under attack from government military positions about five miles in that direction. Using eyewitness testimony and video taken on the day, we've tried to piece together what happened. The filming started right here from this vantage point as the artillery shells landed just on the other side of the building. A local activist gave us this footage. He says it was taken as the shells landed. We can't verify these images, but all the videos you're going to see were apparently taken on the same day by different people we met. A helicopter is spotted high above the town. Eyewitnesses allege at least two canisters were dropped from it. They say it was shortly after they landed that the casualties started to arrive at saraqeb hospital. Eight people were admitted, apparently with similar symptoms. They appear to be vomiting with breathing problems. The worst affected was maryam khatib. Relatives claim a device had landed in her garden. Doctors who treated her claim she had exposure to chemical agents. The mother of eight died later that day. Mohammed is the eldest son. He says he tried to help his mother, but she collapsed in his arms. It was a horrible, suffocating smell. You couldn't breathe at all. Your body would become really tired. You'd lose all senses. You'd feel like you were dead. Reporter: Samples have been taken from here and from the victims and sent to britain, france, turkey and america for testing. A british chemical expert has looked at the material and what happened here and says there is strong but incomplete evidence a nerve agent was used. But it doesn't show who is responsible, and for people like mohammed, the real issue isn't how people were killed, it's death itself and, what they say, is the indifference of the world to their plight. For abc news, ian pannell, bbc news, saraqeb, syria.

This transcript has been automatically generated and may not be 100% accurate.